wpt/css/selectors/focus-in-focus-event-001.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Selectors Level 4: :focus, :focus-visible and :focus-within in focus event</title>
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors-4/#focus-pseudo">
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors-4/#focus-visible-pseudo">
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors-4/#focus-within-pseudo">
<link rel="help" href="https://un5gnp8dyv5rcyxcrjjbfp0.julianrbryant.com/uievents/#event-type-focus">
<link rel="help" href="https://un5neav4tjf40.julianrbryant.com/523126">
<meta name='author' title='Takayoshi Kochi' href='mailto:kochi@chromium.org'>
<meta name='author' title='Manuel Rego Casasnovas' href='mailto:rego@igalia.com'>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<input type="text">
<script>
var input = document.querySelector('input');
input.addEventListener('focus', function(e) {
  test(() => {
    try {
      var focusPseudo = document.querySelector(':focus');
      assert_equals(e.target, focusPseudo, "':focus' matches event.target");
    } catch (error) {
      assert_unreached("':focus'  is an invalid selector. SyntaxError: " + error);
    }
  }, "Checks that ':focus' pseudo-class matches inside 'focus' event handler");
  test(() => {
    try {
      var focusVisiblePseudo = document.querySelector(':focus-visible');
      assert_equals(e.target, focusVisiblePseudo, "':focus-visible' matches event.target");
    } catch (error) {
      assert_unreached("':focus-visible'  is an invalid selector. SyntaxError: " + error);
    }
  }, "Checks that ':focus-visible' pseudo-class matches inside 'focus' event handler");
  test(() => {
    try {
      var focusWithinPseudo = document.querySelector(':focus-within');
      assert_equals(document.documentElement, focusWithinPseudo, "':focus-within' matches document.documentElement");
    } catch (error) {
      assert_unreached("':focus-within'  is an invalid selector. SyntaxError: " + error);
    }
  }, "Checks that ':focus-within' pseudo-class matches inside 'focus' event handler");
}, false);
input.focus();
</script>